/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraEditorSettings.h
[FNiagaraNamespaceMetadata](API\Plugins\NiagaraEditor\FNiagaraNamespaceMetadata) & AddOptionalNamespaceModifier ( [FName](API\Runtime\Core\UObject\FName) InOptionalNamespaceModifier )